Guard for presses and the like.



P. KEMPTER. GUARD FOR PRESSES AND THE LIKE.

APPLIGATION FILED APR. 22, 1912.

Patented Dec. 31, 1912.

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GUARD FOB PRESSES AND THE LIKE. APPLICATION FILED APR. 22, 1912. 1,049,102 Patented Dec.31, 1912.

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Helms Imus, Inc. Lmn mmncvm or c P. KEMP-TEE. GUARD FOR PBESSES AND THELIKE. APPLICATION FILED APR. 22, 1912.

1,049, 1 02, Patented Dec. 31, 1912.

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45 1 tently operating tools and t-readles or other view; Figs. 5

uniran srirrns Parana orrion rH'ILir or MILWAUKEE, Wisconsin,Assronoa'ro saunas, rnnscnnn a Fania" so, or MILWAUKEE, WISCONSIN, ACOEPORA-TXO'N or 'WISCONSIN.

GUARD FOR PRESLSES AND THE LIKE.

specification 9i Letters Patent.

Patented nee. 31,1912.

dontinuation or application Serial No. 608,4757filed February 4, 1911.This application filed April 22,

1912. seri ino. 692,295.

To all whom it may concern:

Be it known that I, Priimr Knitr'rnn. a

citizen of the United States, residing at Milwaukee, in' the county ofMilwaukee and State of lVisconsin, "have invented certain new and usefulImprovements in Guards for Presses and the Like, of which the followingisa spec-ification reference being had to the accompanying drawing,forming apart thereof. V

This invention relates more particularly to attachments for presses ormachines having reciprocating or intermittently operating tools, such aspunching, cutting and stamping machines. its main object is to preventinjury to the hands of the operatives of such machines withoutinterfering with the adjustments and proper operation of the machines. 1

It consists in the construction, arrange- ;ment and combination of partsas herein- Eafter particularly described and pointed out fin the claims.I

In the accompanying drawing li'ke characters designate the same parts inthe several figures. I r

Figure 1 is a side elevation of a punching press to which the tool guardis applied in accordance with the-in'ventionyh ig. 2 is an enlargedfront elevation of the upper portion of the press showing the guardfolded; Fig. 8 is a front elevation the guard and the bed of the pressshowing the guard unfolded or extended to block the approach to thetool; Fig. a is across section on the line F 52, showing the guard inplan and 6 are detail views-of parts of the guard operating connections;and Fig.

7 a 7 is a partial front elevation of the preferred form of the guard. p

For the purpose of illustration a guaru embodying the invention is shownas app-lied to a unc-hing machine or press, hutit is applicablewithin-He or no change to other-niachines having reciprocating orintermitmeans for controlling the operation of the tools, such as stampng, cutting, embossing and drawing presses or similar machines.

Referring to the drawing, a designates l r t f the frame of a unchinmthe upper PM i O p D 'i nterferein the least with the:- operation ofmachine or presswhich in the pres'entw"-ca.se is pivotally or adjustahlymounted on the base or lower part l? of the frame so as to set Fig. 3,to permit of, the

the punch in a vertical position or at any The. machinev desiredinclination thereto. has the usual vertically reciprocating cross headand tool holder 0., guided in waive (Z on the frame a, andronnected by apitma-ire with a horizontal cranlr or eccentric shaftj" mounted "aboveitin hearings on l'llQfilIlilG a,

in the usual or any suitable manner. The press has a trip g connected bya rod h with a treadle or foot lever 2' for operating a clutch j bywhich the drive wheel is loosely mounted on the shaft is locked,

thereon when the treadle or footle-ver i is depressed. A retractingspring Z connecting the treadle or foot lever i with the frame section baided by a spring m on the trip 9, automatically disconnects the shaftfrom the drive wheel is when the treadle or foot lever i is released bythe operator.

The machine thus briefly described, is of a common well known type towhich no claim per se is made herein. r

The guard constituting the present invention is adapted to unfold up ordown across the approach to the tool of the press-or other machine, andwhen folded to completely clear the approach- .to the tool both from thefront and the sides of the press or machine. It consists of two parallelbars a and 0, which are connected witheach-other by lazytongs p, asshown in Figs. 2 and 3. In the present case the lazy-tongs are shown asdouble to afford when extended or unfolded,

a more effective barrier across the approach lized for this purpose, asshown in Fig.- 4.

The upper and lower members of the lazytongs 79 have horizontallyslotted pivot connections with the bars n and 0, as shown in folding andunfolding of the'lazytongs, which :fold compactly, permitting thelowermovablebar 0 to approach close tdtheupper stationarybar a, asshowri'iirfFig. 2: W hen thus folded, the uard is entirely out ofthe wayand does not the machine, or with the removal, replacement andadjustment of tools or dies therein.

In the present case the machine is shown as furnished with a punch 1 inthe cross head or tool holder 0 and with a die 8 on the bet! orworksupport t. The guard is so applied to the machine that when it is closedor folded and the cross head or tool holder r: with the punch or tool 1'is in its upper position shown in Figs. 1 and 2, the space between thecross head and table 2- will be entirely clear and unobstructed forfeeding end of the bar 0 and fulcrumed at its rear end on the side ofthe frame .11, connected by a rod with the treadle or foot lever} insuch a any as to unfold orextend the guard downwardly in 'advanceof thetripping of the clutch j and the descent of the cross head 0 with thepunch r or other tool carried thereby when the treadle foot lever i isdepressed by the operator to start the machine.

The operating connections of the trip 9 and the lever a with the treadlei are so arranged and' adjusted that the guard will be extended and thebar o carried into contact or close proximity with the bed If as shownin Fig. 3, before the trip" is moved into posi tion to engage the clutchand start the tool, so that if the descent of the bar 0 is arrestedbefore it reaches the bed t, the operation of the tool will beprevented, thereby absolutely avoiding injury to the hands and tingersof the operator without interfering in the least with the properoperation of the machine.

To aid in holding the-movable bar 0 parallel with the stationary bar n.ofthe guard, the lever u is formed at its front end with an extendedsleeve w fitting upon an extended pivot pin w formed with or attached tothe bar 0, as shown in Fig. 6.

. Folvarying the limits of the. movement of the lever u in applying theguard to different machines and to compensate for changes in theinclination or adjustment of the upper part a of the frame with relationto the base or lower part b, the fulcrum connection of the lever withthe frame is made adjustable. For this purpose the fulcrum pin 3 isadjustably fastened by a nut z in a vertical slot of a looped keeperorangular bar 2, which is bolted 'to one side of the frame section a. asshown in Figs. 1 and 5. The pin 3 is adjusted up or down in the keeperor bar 2 by a screw 3, having a swivel I connection with said pin andtlll'emletl in the upper part of the keeper or bar in which or to limitthe downward movement of the bar 0 at different points for differentkinds of work, as, for example, work which when placed in position inthe machine projects forwardly beyond the path of the guard.

To prevent the operator from reaching around the ends of the guard intothe path of the tool and at the same time starting the machine, themovable bar 0 of the guide is formedbr provided at or adjacent to itsends with rearwardly extending arms'f), as shown in Figs. 1, 4 andfi.

\Vhen the guard is made of considerable length. to insure its unfoldingalike at both ends and to keep the movable bar 0 parallel with thestationary bar n. two corresponding upper members of the lazy-tongs areextended, as shown in Fig. 7. beyond the pivots between them and the bara and are connected with said bar by springs 6, which take up play orlost motion in the pivot joints of the lazy-tongs and cause the bar 0 tomove parallel with the bar a and the bedi when the guard is unfolded andfolded.

In the operation of the machine the attendant having placed a blank orpiece of material to be punched on the die a. depresses the' treadle 2'which operates through the lever u to first spread or extend the guardand. carry the bar 0 thereof down against the bed t, as shown by dottedlines in Fig. 1' and by full lines in Fig. 3. and

then after the approach to the punch and die is effectively blocked bythe unfolding or spreading of the guard. to operate the clutch j andthereby cause the punch to de scend. When the treadle is released by theoperator the retracting spring Z. drawing it back into its originalposition'as shown in Fig. 1, operates through the connectionshereinbefore-described to close or fold the guard upwardly out of theway and to dis-- engage the clutch and stop the cross head 0 and punchafter they-have been withdrawnto their upper position.

\Yith the construction and arrangement of the operating connections ofthe clutch, trip and tool guard as herein shown and described, theoperator cannot Start the maline or set the toolin motion without firstcausing the guard to descend across and block theapproach to the tool,and as long the tre'adle is depressed and the tool continucs to operate.the guard will remain extended and obstruct the approach thereto.

A repet tion of the operation of the punch cannot take place withoutextendingthe guard in advance thereof or its being held extended so asto ett'ectually prevent the operator from thrusting his hands orfingersinto dangerous proximity With the punch.

Variouschanges in the details of construction and arrangement of partsof the device in adapting and applying it to difierent machines forditferent purposes and under varying conditions may be made wit-houtdeparting from the principle and scope ---operation of its movable toolor member, of

a guard attachable to a stationary part of the press out of the approachto the tool, movable up and down across the approach to the tool andadapted to fold into small compass clear of the approach to the toolboth in -t'ront and at the sides of the press, and when untolded toobstruct the approach to the tool, and means connected with said guardand with said controlling means and adapted to cause the unfolding ofthe guard in advance of the operation of the tool.

2. Therco-mbination with a press comprising means for controlling itsoperation, of a folding guard attachable to the press above the approachto the tool and adapted to fold upwardly into small compass and tounfold downwardly across and obstruct the approach to the tool, andmeans connected with said guard and cont-rolling means and adapted toeause the unfolding of the guard in ad ance of the operation of the tooland prevent the operation of the tool when the 4 unfolding of the guardis obstructed.

n o. A

tool guard for presses, consisting of parallel bars one of which isadapted to be attached to the frame of the press, and the other ismovable across the approach tothe tool, and lazy-tongs connecting sa1dbars.

ll In a tool guard for a press having a reciprocating tool and a leverfor controlling its operation, the combination of parallel bars one ofwhich is adapted to be attached to the frame of the press, and the otheris movable across the approach to the toolglaZy-tongs connecting saidbars,' avlever connected with the movable bar and adapted to befulcrumed on said frame, and a rod for connecting said lever with thetool controlling lever, the parts being arranged and connectedto unfoldthe guard in advance or" the operation of the tool. and to prevent theoperation of the tool when theuniolding of the guard is obstructed.

-5. In a tool guard for a press, havin a reciprocating tool and a leverfor cont lling its operation, the combination of a folding guardattachable to the frame ot' the press and extensible downwardlyinunfolding across the approach to the tool, alever connected with thelower part of said guard and provided with an adjustable fulcrum .forattachment to the frame of the press and a rod for connecting said leverwith the tool controlling lever.

6. The combination with a press having reciprocating tool and a leverfor controlling its operation, of a folding tool guard attached at theupper side to the frame of the press and extensible downwardly acrossthe approach to the tool, a lever tulclrumed on the frame of the pressand connected with the lower part of said guard, and a rod adjustablyconnecting said lever with the tool controlling lever so as to extendthe guard in advance of the operation of the tool and to prevent theoperation of the tool it the unfolding of the guard is obstructed.

7. In a tool guard for a press having a reciprocating tool and aleverfor controlling its operation, the combination at a folding guardconslst-ing of parallel bars con nected by lazy-tongs, means forattaching the upper bar to the frame of the press above the approach tothe tool, a lever pivoted to one end of the lower bar and adapted tober-fulcrumed on the frame of the press and a rod for connecting saidlever with the tool controlling lever to unfold tin in advance of theoperation of the tool and t prevent the operation of the tool itthermfolding of the guard is obstructed.

-8. A tool guard for presses, comprising parallel bars one of which isattachable to a stationary part of the press out ofthe ap proach to thetool and the other is movable across the approach to the tool andprovided with rea-rwardly extending arms arranged protect the approachto the tool at the sides, and lazy-tongs connecting said bars.

9. A toolguard .for presses, comprising parallel bars one of which isattachable to a stationary part of the press out of the ap proach to thetool and the other is movable across the approach to the tool,lazy-tongs connecting said bars, and springs connect- 'ing one of saidbars with members of the c lazy-tongs and tending to keep the movablebar parallel with the stationary bar.

10. A tool guard for presses comprising a vertically movable horizontalbar pro vided with rearwardly projecting arms arranged to protect 'theapproach to the tool at the sides, lazy-tongs'connecting said bar with astationary part of the mach1ne,.and

means for unfolding said lazy-tongs and carrying said bar across theapproach to the tool in advance of the operation of the tool andpreventing the operation of the tool when the extension of the guard isob str'ucted.

11. A tool guard for presses, comprising a horizontal bar movable"ertically across the approach to the tool, lazy-tongs connecting saidbar with a stationary part of the press, means for unfolding saidlglzy-tongs and carrying said bar across the approach to the tooladvance of the operation of the tool and preventing the operation of thetool bGI'S of the lazy-tongs and tending to nd a Vance and withdraw saidbar alike at both ends.

In wltness whereof I hereto athx my'slgnature in presence of twoWitnesses.

PHILIP KEMPTER.

Witnesses:

' CHAS. L.- Goss,

F. FREY.

